Carlos V. Opelt
The Catholic University of America
Composite numberUltimate tensile strengthComposite laminatesCopolymerComposite materialEpoxyTribologyThermosetting polymerCompression (physics)Materials sciencePlain weaveContext (language use)High strain ratePolymer nanocompositeElastic modulusFractographyNanoindentationCarbon nanotubeFiberPolymerFailure mode and effects analysisFibre-reinforced plasticNanocompositeFracture toughness
17Publications
8H-index
191Citations
Publications 16
Newest
#1Carlos V. Opelt (UDESC: Universidade do Estado de Santa Catarina)H-Index: 8
#2Luiz A. F. Coelho (UDESC: Universidade do Estado de Santa Catarina)H-Index: 17
Abstract Although the effects of the incorporation of nanoparticles in polymer matrices are deeply studied in the literature, the mechanisms that promote higher properties are not well reported. In this paper, the reinforcement and toughening mechanisms that act on nanoclay/epoxy nanocomposites were studied. For this purpose, two types of nanoclays were used (sodium nanoclay and organophilic nanoclay) in three different concentrations. We propose the reinforcement effectiveness concept, which pr...
13 CitationsSource
The composite prepreg waste is still an environmental challenge. In the last decade, several researchers have been studying the recycling and reuse processes of composite components, mainly to use in secondary (non-structural) components. In this paper, uncured aerospace grade prepreg scraps resulted from the production waste were used to manufacture laminates. The carbon reinforcement of the prepreg presented plain weave style fabric. To manufacture the laminates the hand-lay up process was use...
8 CitationsSource
#1Carlos V. Opelt (UDESC: Universidade do Estado de Santa Catarina)H-Index: 8
#2Daniela Becker (UDESC: Universidade do Estado de Santa Catarina)H-Index: 12
Last. Luiz A. F. Coelho (UDESC: Universidade do Estado de Santa Catarina)H-Index: 17
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Abstract The addition of nanoparticles has been reported as an option to increase the fracture toughness of thermosetting polymers without compromising the stiffness. In this paper, alumina or carbon nanotubes (CNTs), in three different concentrations, were dispersed in an epoxy resin. Mechanical properties were measured through tensile test and the results indicate increases for all nanocomposites, with a maximum for the addition of 0.5% of CNTs (17% in elastic modulus and 22% in ultimate stres...
46 CitationsSource
#1Jonas Bertholdi (UDESC: Universidade do Estado de Santa Catarina)H-Index: 2
#2Carlos V. Opelt (UDESC: Universidade do Estado de Santa Catarina)H-Index: 8
Last. Carlos Maurício Lepienski (UFPR: Federal University of Paraná)H-Index: 25
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This work studied the effects of the addition of Multiwalled Carbon Nanotubes (MWCNT) to a PLLA matrix. Two distinct methods of preparation were employed: a combination of a solvent/ mechanical stirring and a combination of a solvent/high energy sonication. The mechanical properties of the nanocomposites were determined by nanoindentation and by the Vickers hardness test. Thermal properties of the nanocomposites (Tg, Tc, Tm and crystallinity degree) were determined by DSC. The tribological prope...
1 CitationsSource
#2Carlos V. OpeltH-Index: 8
Last. Luiz A. F. Coelho (UDESC: Universidade do Estado de Santa Catarina)H-Index: 17
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In this study, the thermal, dynamic-mechanical and tribological behavior of nanocomposites of a photocurable epoxy-acrylate resin and multiwalled carbon nanotubes (MWCNT) are investigated. A route consisting of a combination of sonication, mechanical and magnetic stirring is used to disperse 0.25-0.75 wt. (%) MWCNT into the resin. Two photocuring cycles using 12 hours and 24 hours of UV-A radiation are studied. The storage modulus, the loss modulus and the tan delta are obtained by dynamic mecha...
9 CitationsSource
#1Marcos Nunes dos Santos (UDESC: Universidade do Estado de Santa Catarina)H-Index: 2
#2Carlos V. Opelt (UDESC: Universidade do Estado de Santa Catarina)H-Index: 8
Last. Luiz A. F. Coelho (UDESC: Universidade do Estado de Santa Catarina)H-Index: 17
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Abstract In this work, thermal and mechanical behaviors of nanocomposites of a photocurable epoxyacrylate resin and multiwalled carbon nanotubes (MWCNT) were investigated. A combination of sonication, and mechanical and magnetic stirring was used to disperse 0.25 wt% and 0.75 wt% of MWCNTs into the resin. Two photocuring cycles using 12 and 24 h UV-A radiation were studied. Nanoindentation was the chosen technique for characterizing the modulus of elasticity and hardness of samples. The curing d...
36 CitationsSource